Results 31 to 40 of about 445,447 (209)
The Relationship Between Recent and Old Star Formation in Dwarf Irregular Galaxies [PDF]
Iranian Journal of Astronomy and AstrophysicsIn this paper, we investigate the structural properties of local dwarf irregular galaxies, including optical scale lengths, position angles, and star formation rates, using data from the LITTLE THINGS survey. Our analysis is based on a sample of 24 dwarf
Aysan Hemmatiortakand +2 more
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The Astrophysical JournalThe cusp–core problem remains a challenge to the ΛCDM model, since dwarf galaxies often exhibit flat central density cores rather than the steep cusps ( ρ ∝ r ^−1 ) predicted by collisionless N -body simulations.
Saroj Khanal +3 more
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The inclination of the dwarf irregular galaxy Holmberg II
, 2014 We provide constraints on the inclination angle of the H\,{\sc i} disk of the dwarf irregular galaxy Holmberg II (Ho II) from stability analysis of the outer gaseous disk. We point out that a mean inclination angle of 27 degrees and thus a flat circular velocity of ~60 km/s, is required to have a level of gravitational stability similar to that found ...
F. J. Sánchez-Salcedo +2 more
openaire +3 more sources
Evidence for Mass-dependent Evolution of Transitional Dwarf Galaxies in the Virgo Cluster
The Astrophysical JournalThe presence of transitional dwarf galaxies in cluster environments supports the hypothesis that infalling star-forming galaxies are transformed into quiescent early-type dwarf galaxies (ETdGs) through environmental effects.
Suk Kim, Soo-Chang Rey, Youngdae Lee
doaj +1 more source
Infrared Properties of Star-forming Dwarf Galaxies. I. Dwarf Irregular Galaxies in the Local Volume [PDF]
The Astronomical Journal, 2005 A sample of 34 dwarf irregular galaxies in the Local Volume, most nearer than 5 Mpc, has been imaged in the near-infrared (NIR) in J and K_s at CFHT in Hawaii and OAN-SPM in Mexico. In CFHT images, stars brighter than M_Ks=-7.5 were resolved. In most cases, the resolved population represents less than 5% of the total NIR flux in K_s.
Vaduvescu, Ovidiu +3 more
openaire +2 more sources
Empirical Dependencies for Irregular and Elliptical Dwarf Galaxies
Moscow University Physics BulletinThis study examines the physical properties and correlations for dwarf galaxies, including irregular (dIrr) and elliptical (dE) types. Data from the NASA/IPAC and HyperLEDA databases were used to analyze relationships among parameters such as distance to galaxy, absolute magnitude of galaxy, mass of galaxy, and surface brightness of galaxy using ...
K.T. Tillaboev, I.U. Tadjibaev
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Star Formation in Sculptor Group Dwarf Irregular Galaxies and the Nature of “Transition” Galaxies [PDF]
The Astronomical Journal, 2003 35 pages, 10 figures, accepted for Feb 2003 AJ, companion to astro-ph ...
Skillman, Evan D. +2 more
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Metal-poor dwarf galaxies in the sigrid galaxy sample. I. H II region observations and chemical abundances [PDF]
, 2015 In this paper we present the results of observations of 17 HII regions in thirteen galaxies from the SIGRID sample of isolated gas-rich irregular dwarf galaxies.
Dopita, Michael +5 more
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A Young Star Cluster in the Leo a Galaxy
Open Astronomy, 2015 We report a serendipitous discovery of a star cluster in the dwarf irregular galaxy Leo A. Young age (~28 Myr) and low mass (~510 M⊙) estimates are based on the isochrone fit assuming a metallicity derived for HII regions (Z = 0.0007).
Stonkutė R. +4 more
doaj +1 more source
, 2002 R-band surface photometry is presented for 171 late-type dwarf and irregular galaxies. For a subsample of 46 galaxies B-band photometry is presented as well. We present surface brightness profiles as well as isophotal and photometric parameters including
Balcells, M +4 more
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